body {
    background: rgba(231, 102, 102, 0.74) url("../image/01.jpg") no-repeat center 0;
    background-size: 95%;
}
.box {
    /*width: 500px;*/
    height: 500px;
    margin: 20px auto;
    border: 5px pink solid;
    background-color: rgba(255, 192, 203, 0.644);
}

.box .button {
    width: 80%;
    height: 30px;
    margin: 30px auto;
    border: 2px red solid;
    display: block;
    text-align: center;
    line-height: 30px;
    background-color: rgba(255, 192, 203, 0.678);
}

a {
    text-decoration: none;
    font-size: 20px;
}